Centrifugal fan



Oct- 5, 194s,

P- ANDERSON Filed De 25' 1946 2 SheetS-Sheei;I 1

INVENTOR PAULANDERSQN ATTn R N EYB Oct- 5, 1948- P. ANDERSON l2,450,708

CENTRIFUGAL FAN 2 Sheets-Sheet 2 Filed Deo. 25, 1946 [y0 INVENTOR.

PAUL ANDERSON ATTE RN EYB Patented Oct. 5, 1948 UNITED STATES PATENTOFFICE 2,450,708 e l Y CENTRIFUGAL FAN Paul Anderson, San Antonio, Tex.

Application December 23, 1946, Serial No. 717,871

2 Claims. l

My present invention relates to an improved centrifugal fan of the typeespecially designed for use in exhausting air from the upper floor of abuilidng into and through an attic. The fan of my invention is normallyplaced over an opening in the ceiling of the upper floor such as astairway or trap door, and the fan will draw the air to be exhausted upinto the fan from which it will be discharged by centrifugal action.

The fan of my invention is light in weight, strong and durable and beingof large size to move a maximum of air includes certain trussarrangements and features as will be hereinafter more fully described.

In the accompanying drawings I have illustrated one complete example ofthe physical embodiment of my invention according to the best mode Ihave thus far devised, but it will be understood that various changesand alterations may be made in the exemplified structure within thescope of the appended claims.

In the drawings:

Figure 1 is a top plan view of the fan of my invention.

Figure 2 is a vertical sectional View.

Figure 3 is a bottom plan.

Figure 4 is a side elevational view, and

Figure 5 is a combined view showing stages of preparing the fan blades.

Referring now to the drawings I` have illustrated the preferredembodiment of my invention as including the radially-disposed upperinclined spider frame arms 2 and the lower horizontallydisposed spiderframe arms 4 forming upper and lower supports for thevertically-disposed cylindrical support or housing 6 in which arelocated ball bearings 8 and i0 for the shaft I2. Collar I4 on the upperend of the shaft is secured by set screw it.

A motor IS is mounted on the vertically-disposed bracket on one side ofthe spider frames and a V-belt 22 drives a horozontally-disposed disk 2dfixed on the shaft l2.

A circular plate 28 is positioned on the shaft for rotation therewithand this disk is upwardly dished on the spacer disk 28. A lower convexbaiiie plate 30 under the disk 28 is downwardly dished, the two plates26 and 3l) lens type baffle, the two plates being secured as by units32, and the collar @il retaining the assembly on the shaft and securedby set screw 36.

A lower open center ring 38 is provided to secure the lower ends of thespaced, parallel, vertically-disposed blades 40. These blades are formedof elongated rectangular metal plates apertured at 42 and as seen inFigure 5 the plates are bent transversely as at 44 and the ends are thencrimped at 46 so that the flanges 48 may be attached to the plate 26 andthe ring 38 by bolts or rivets 50.

vertically-disposed, spaced, parallel legs 52 depending from the upperframe arms 2 have disks and rubber pads 5d to support the fan with aminimum noise transmission above the floor level.

With the assembled fan in position and rotating, the blades will createa suction through the ring 38 and the lens type baille will aid themovement of air upwardly through the ring and out between the spacedblades. It will be noted that the driving motor is located within thehorizontal planes of the fan so that the motor will be cooled by theblast of air exhausted through the blades.

From the above description it will be apparent that I have devised a fanfor the purpose described, light in weight and durable and designed toefficiently withdraw and discharge hot air from a dwelling or otherbuilding at a minimum cost.

Having thus fully described my invention, what I claim as new and desireto secure by Letter Patent is:

l. In a centrifugal fan, a plurality of spaced parallelvertically-disposed legs supported on a horizontal surface, a firstplurality of horizontally-disposed radial frame arms secured to theupper ends of said legs, a vertically-disposed cylindrical housingsupported by the other ends of said frame arms, a shaft rotatablymounted in said housing, a circular plate positioned below said framearms and secured to said shaft, a convex bafe plate arranged below saidcircular plate and secured to the latter, a plurality of spaced parallelvertically-disposed blades each having its upper end secured to saidcircular plate, a ring spaced below said circular plate and secured tothe lower ends of said blades, a horizontally-disposed pulley interposedbetween said circular plate and said frame arms, a vertically-disposedbracket secured to one of said legs, a drive motor carried by saidbracket, and belt means operatively connecting said pulley to saidmotor.

2. In a centrifugal fan, a plurality of spaced parallelvertically-disposed legs supported on a horizontal surface, a firstplurality of horizontally-disposed radial frame arms secured to theupper ends of said legs, a vertically-disposed cylindrical housingsupported by the other ends of said frame arms, a shaft rotatablymounted in said housing, a circular plate positioned below said framearms and secured to said shaft, a con- Vex bafe plate arranged belowsaid circular plate connecting said pulley to said motor, and resilientl0 means on the lower end of each of said legs for reducing noisetransmission when said fan is be'- ing used.

PAUL ANDERSON,

REFERENCES CITED The following references are of record in the le ofthis patent:

Number UNITED STATES PATENTS Name Date Winton Apr. 23, 1940 Beeler Dec.28, 1943

